21643450466 has 16 divisors (see below), whose sum is σ = 35747555040. Its totient is φ = 9745987680.

The previous prime is 21643450463. The next prime is 21643450531. The reversal of 21643450466 is 66405434612.

It is not an unprimeable number, because it can be changed into a prime (21643450463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4594811 + ... + 4599518.

It is an arithmetic number, because the mean of its divisors is an integer number (2234222190).

Almost surely, 2^21643450466 is an apocalyptic number.

21643450466 is a deficient number, since it is larger than the sum of its proper divisors (14104104574).

21643450466 is a wasteful number, since it uses less digits than its factorization.

21643450466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9194449.

The product of its (nonzero) digits is 414720, while the sum is 41.

The spelling of 21643450466 in words is "twenty-one billion, six hundred forty-three million, four hundred fifty thousand, four hundred sixty-six".